Chow Yun Fat plays a veteran inmate Chung Tin Ching. When serving his term, Ching’s mother passed away his son is sent to an orphanage. When his application for leave is turned down, he breaks out of prison, further antagonizing the new Head of Security, played by Tsui Kam Kong. Chen Sung Yung plays a fellow inmate from the Mainland, Lung who befriends Ching. When he is framed for murder, Ching is implicated in fingering him. Ching and Lung must break out of prison to stay alive...